The latest stable release of Ubuntu 11.10 Oneiric Ocelot brings a new feature that allows to compare a set of installed programs with other Ubuntu computers using Ubuntu Software Center. This is possible with the help of OneConf, which is integrated in Ubuntu Software Center.OneConf provides users the ability to synchronize a computer configuration data so that this data can be then synchronized with other computers running Ubuntu. You can use this feature by opening Ubuntu Software Center, then clicking File > Sync Between Computers: